This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 12 |
| 2 | 216 |
| 3 | 2592 |
| 4 | 25920 |
| 5 | 233280 |
| 6 | 1959552 |
| 7 | 15676416 |
| 8 | 120932352 |
| 9 | 906992640 |
| 10 | 6651279360 |
| 11 | 47889211392 |
| 12 | 339578044416 |
| 13 | 2377046310912 |
| 14 | 16456474460160 |
| 15 | 112844396298240 |
| 16 | 767341894828032 |
| 17 | 5179557790089216 |
| 18 | 34733505180598272 |